How do i Call an a method on and object that is a parameter

Question

I have thee code as below.
I want to call the method setValue and set the value and pass it a String. i want it called on the jobject param1.
What do i need to call todo that given the below code.
JNIEXPORT jobject JNICALL
Java_PassObjectAndDoSomething_nativeMethod(JNIEnv *env, jobject obj, jobject param1) {
    jstring jstr;
    jclass cls2 = (*env)->GetObjectClass(env, param1);
    jmethodID mid3 = (*env)->GetMethodID(env, cls2, "setValue", "(Ljava/lang/String;)V");
    if (mid3 == NULL) {
        return NULL;
    jstr = (*env)->NewStringUTF(env, "My brand new JString");
    if (jstr == NULL) {
         return NULL;
    /*This causes errors when called*/
    (*env)->CallObjectMethod(*env, param1, mid3, jstr);
    return param1;
}

Answer 1

daniel_p wrote:
/*This causes errors when called*/Presumably you mean a system exception and not java exception of some sort.
(*env)->CallObjectMethod(*env, param1, mid3, jstr);Why is the asterisk in front of the env parameter in CallObjectMethod()?
return param1;Since you passed that in it is obviously pointless to return it. But that has nothing to do with your problem.